I have built a custom board and I have used the reference design provided with NUCLEO-L476RG. When I apply power to the board it doesn't power up. I have to connect VCC form powe supply on board and connect NRST on board to GND from power supply remove GND from NRST on board and then connect the GND on the board to GND from power supply.
I have attached the circuit for reference.
Any help is really appreciated.